Thomas Reid's Essays on the Intellectual Powers of Man is widely recognized by intellectual historians, historians of philosophy and contemporary philosophers as a major philosophical text. It played a central role in the Scottish Enlightenment, presenting a clear and powerful alternative to David Hume's scepticism, and it continues to inspire and challenge the work of epistemologists and moral philosophers. This edition of Thomas Reid's Essays on the Intellectual Powers of Man provides both a critically edited text of the work and the complete manuscript evidence relating to its composition.